Public bug reported:
Firstly I want to note that this is not a Jammy specific bug. I have
used ubuntu focal, and impish and note it there as well (it may exist on
older releases, I have not tested).
When using multiple monitors with the Xorg backend, scaling does not
work properly. I have a 4K 27in monitor (on the right) and a 1080p
21.5in monitor (on the left). I would like to scale my 4K monitor to
150% and leave the 1080p monitor at 100%. Doing this works correctly in
wayland. However, doing this is gnome (through the gnome settings
display dialog) produces the wrong outcome. Setting the 4K monitor to
150% scales BOTH the 4K display (right) and the other 1080p display
(left). the 1080p display scaling should not change as per the gui but
it does and cuts of the viewable area.
I have attached before scaling and after scaling images to this to help show
what is happening.
I realize this may not be a gdm3 bug, please assist in moving this bug to the
correct location as necessary.
xrandr output for before scaling is as follows:
```
Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 16384 x 16384
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
DisplayPort-3 connected primary 3840x2160+1920+0 (normal left inverted right x
axis y axis) 600mm x 340mm
3840x2160 60.00*+ 30.00
2560x1440 59.95
1920x1200 60.00
1920x1080 60.00 59.94
1600x1200 60.00
1680x1050 60.00
1600x900 60.00
1280x1024 60.02
1440x900 60.00
1280x800 59.81
1152x864 59.97
1280x720 60.00 59.94
1024x768 60.00
800x600 60.32
720x480 60.00 59.94
640x480 60.00 59.94
DisplayPort-4 disconnected (normal left inverted right x axis y axis)
HDMI-A-3 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-2 connected 1920x1080+0+1080 (normal left inverted right x axis y axis)
477mm x 268mm
1920x1080 60.00*+
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
720x400 70.08
DP-1-2 disconnected (normal left inverted right x axis y axis)
HDMI-1-3 disconnected (normal left inverted right x axis y axis)
1920x1080 (0x5e) 148.500MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz
v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz
1280x1024 (0x63) 108.000MHz +HSync +VSync
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz
1024x768 (0x69) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
800x600 (0x6a) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
640x480 (0x6e) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
```
xrandr output for when scaling is applied is as follows:
```
Screen 0: minimum 320 x 200, current 8960 x 2880, maximum 16384 x 16384
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
DisplayPort-3 connected primary 5120x2880+3840+0 (normal left inverted right x
axis y axis) 600mm x 340mm
3840x2160 60.00*+ 30.00
2560x1440 59.95
1920x1200 60.00
1920x1080 60.00 59.94
1600x1200 60.00
1680x1050 60.00
1600x900 60.00
1280x1024 60.02
1440x900 60.00
1280x800 59.81
1152x864 59.97
1280x720 60.00 59.94
1024x768 60.00
800x600 60.32
720x480 60.00 59.94
640x480 60.00 59.94
DisplayPort-4 disconnected (normal left inverted right x axis y axis)
HDMI-A-3 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-1 disconnected (normal left inverted right x axis y axis)
HDMI-1-2 connected 3840x2160+0+720 (normal left inverted right x axis y axis)
477mm x 268mm
1920x1080 60.00*+
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
720x400 70.08
DP-1-2 disconnected (normal left inverted right x axis y axis)
HDMI-1-3 disconnected (normal left inverted right x axis y axis)
1920x1080 (0x5e) 148.500MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz
v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz
1280x1024 (0x63) 108.000MHz +HSync +VSync
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz
1024x768 (0x69) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
800x600 (0x6a) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
640x480 (0x6e) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
```
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gdm3 42.0-1ubuntu4
ProcVersionSignature: Ubuntu 5.15.0-25.25-generic 5.15.30
Uname: Linux 5.15.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu82
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 15 22:34:54 2022
InstallationDate: Installed on 2022-03-16 (31 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220313)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.gdm3.custom.conf: 2022-04-15T17:38:59.992621
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug jammy
** Attachment added: "this is a zip of two images which show before and after
applying scaling"
https://bugs.launchpad.net/bugs/1969256/+attachment/5581010/+files/images.zip
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1969256
Title:
Dual Monitors on Xorg with Scaling is Broken
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1969256/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
